MX19308A - Catalizador para la plimerizacion de olefinas. - Google Patents
Catalizador para la plimerizacion de olefinas.Info
- Publication number
- MX19308A MX19308A MX1930890A MX1930890A MX19308A MX 19308 A MX19308 A MX 19308A MX 1930890 A MX1930890 A MX 1930890A MX 1930890 A MX1930890 A MX 1930890A MX 19308 A MX19308 A MX 19308A
- Authority
- MX
- Mexico
- Prior art keywords
- olefins
- plimerization
- catalyst
- compounds
- zirconocenic
- Prior art date
Links
- 150000001336 alkenes Chemical class 0.000 title abstract 2
- 239000003054 catalyst Substances 0.000 title abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 2
- 238000006116 polymerization reaction Methods 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
- C08F4/65912—Component covered by group C08F4/64 containing a transition metal-carbon bond in combination with an organoaluminium compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
- C08F4/6592—Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
- C08F4/65922—Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S526/943—Polymerization with metallocene catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polymerization Catalysts (AREA)
- Catalysts (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT8919252A IT8919252A0 (it) | 1989-01-31 | 1989-01-31 | Catalizzatori per la polimerizzazione di olefine. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MX19308A true MX19308A (es) | 1994-02-28 |
Family
ID=11156142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MX1930890A MX19308A (es) | 1989-01-31 | 1990-01-30 | Catalizador para la plimerizacion de olefinas. |
Country Status (21)
| Country | Link |
|---|---|
| US (1) | US5049535A (es) |
| EP (1) | EP0381184B1 (es) |
| JP (1) | JPH03197513A (es) |
| KR (1) | KR900011793A (es) |
| CN (1) | CN1044821A (es) |
| AT (1) | ATE97136T1 (es) |
| AU (1) | AU643673B2 (es) |
| BR (1) | BR9000416A (es) |
| CA (1) | CA2008907C (es) |
| CZ (1) | CZ42990A3 (es) |
| DE (1) | DE69004446T2 (es) |
| ES (1) | ES2048871T3 (es) |
| FI (1) | FI900466A0 (es) |
| HU (1) | HUT53133A (es) |
| IL (1) | IL93203A0 (es) |
| IT (1) | IT8919252A0 (es) |
| MX (1) | MX19308A (es) |
| MY (1) | MY105224A (es) |
| NO (1) | NO175535C (es) |
| PT (1) | PT93024A (es) |
| ZA (1) | ZA90640B (es) |
Families Citing this family (69)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6294625B1 (en) * | 1990-03-20 | 2001-09-25 | Exxonmobil Chemical Patents Inc. | Catalyst system of enhanced productivity and its use in polymerization process |
| US5191132A (en) * | 1991-05-09 | 1993-03-02 | Phillips Petroleum Company | Cyclopentadiene type compounds and method for making |
| US5393911A (en) * | 1991-05-09 | 1995-02-28 | Phillips Petroleum Company | Cyclopentadiene type compounds and method for making |
| CA2067525C (en) * | 1991-05-09 | 1998-09-15 | Helmut G. Alt | Organometallic fluorenyl compounds, preparation and use |
| US5436305A (en) * | 1991-05-09 | 1995-07-25 | Phillips Petroleum Company | Organometallic fluorenyl compounds, preparation, and use |
| US5401817A (en) * | 1991-05-09 | 1995-03-28 | Phillips Petroleum Company | Olefin polymerization using silyl-bridged metallocenes |
| US5594078A (en) * | 1991-07-23 | 1997-01-14 | Phillips Petroleum Company | Process for producing broad molecular weight polyolefin |
| DE69224600T2 (de) * | 1991-11-12 | 1998-08-27 | Nippon Oil Co Ltd | Katalysatorbestandteile für Olefinpolymerisation |
| EP0578838A1 (en) * | 1992-04-29 | 1994-01-19 | Hoechst Aktiengesellschaft | Olefin polymerization catalyst, process for its preparation, and its use |
| US5434116A (en) | 1992-06-05 | 1995-07-18 | Tosoh Corporation | Organic transition metal compound having π-bonding heterocyclic ligand and method of polymerizing olefin by using the same |
| US5910464A (en) * | 1992-06-18 | 1999-06-08 | Montell Technology Company Bv | Catalysts for the polymerization of olefins |
| JPH06100614A (ja) * | 1992-08-06 | 1994-04-12 | Mitsui Petrochem Ind Ltd | オレフィン重合用触媒およびこれを用いるオレフィンの重合方法 |
| US5541272A (en) * | 1994-06-03 | 1996-07-30 | Phillips Petroleum Company | High activity ethylene selective metallocenes |
| US5473020A (en) * | 1994-06-30 | 1995-12-05 | Phillips Petroleum Company | Polymer bound ligands, polymer bound metallocenes, catalyst systems, preparation, and use |
| FR2729393B1 (fr) * | 1995-01-18 | 1997-03-21 | Bp Chemicals Snc | Procede de polymerisation d'olefine |
| US6486089B1 (en) | 1995-11-09 | 2002-11-26 | Exxonmobil Oil Corporation | Bimetallic catalyst for ethylene polymerization reactions with uniform component distribution |
| US6417130B1 (en) | 1996-03-25 | 2002-07-09 | Exxonmobil Oil Corporation | One pot preparation of bimetallic catalysts for ethylene 1-olefin copolymerization |
| US5780659A (en) * | 1996-03-29 | 1998-07-14 | Phillips Petroleum Company | Substituted indenyl unbridged metallocenes |
| DE19621838A1 (de) * | 1996-05-31 | 1997-12-04 | Basf Ag | Verfahren zur Herstellung von Polymerisaten von C¶2¶- bis C¶1¶¶2¶-Alkenen unter Zusatz eines Reaktionsverzögerers |
| DE19637669A1 (de) | 1996-09-16 | 1998-03-19 | Hoechst Ag | Verfahren zur Herstellung einer methylenverbrückten Biscyclopentadienylverbindung |
| US6051525A (en) * | 1997-07-14 | 2000-04-18 | Mobil Corporation | Catalyst for the manufacture of polyethylene with a broad or bimodal molecular weight distribution |
| US6153551A (en) | 1997-07-14 | 2000-11-28 | Mobil Oil Corporation | Preparation of supported catalyst using trialkylaluminum-metallocene contact products |
| IT1293729B1 (it) * | 1997-07-18 | 1999-03-10 | Enichem Spa | Procedimento per la preparazione di copolimeri dell'acrilonitrile con almeno una (di)olefina |
| US5990035A (en) * | 1997-10-21 | 1999-11-23 | Koeppl; Alexander | Polymerization catalyst systems, their preparation, and use |
| US6001766A (en) * | 1997-12-24 | 1999-12-14 | Mobil Oil Corporation | Bimetallic catalysts for ethylene polymerization reactions activated with paraffin-soluble alkylalumoxanes |
| US6420298B1 (en) | 1999-08-31 | 2002-07-16 | Exxonmobil Oil Corporation | Metallocene catalyst compositions, processes for making polyolefin resins using such catalyst compositions, and products produced thereby |
| US7214745B2 (en) | 2001-08-07 | 2007-05-08 | Denki Kagaku Kogyo Kabushiki Kaisha | Process for producing polymer |
| CN1275985C (zh) | 2001-11-30 | 2006-09-20 | 埃克森美孚化学专利公司 | 用非单中心/单中心催化剂结合物制备的乙烯/α－烯烃共聚物及其制备方法和用途 |
| US7119153B2 (en) | 2004-01-21 | 2006-10-10 | Jensen Michael D | Dual metallocene catalyst for producing film resins with good machine direction (MD) elmendorf tear strength |
| US7226886B2 (en) * | 2005-09-15 | 2007-06-05 | Chevron Phillips Chemical Company, L.P. | Polymerization catalysts and process for producing bimodal polymers in a single reactor |
| US7517939B2 (en) | 2006-02-02 | 2009-04-14 | Chevron Phillips Chemical Company, Lp | Polymerization catalysts for producing high molecular weight polymers with low levels of long chain branching |
| US7619047B2 (en) * | 2006-02-22 | 2009-11-17 | Chevron Phillips Chemical Company, Lp | Dual metallocene catalysts for polymerization of bimodal polymers |
| US7576163B2 (en) * | 2006-03-31 | 2009-08-18 | Chevron Phillips Chemical Company, Lp | Polymerization catalysts for producing polymers with low levels of long chain branching |
| US8536391B2 (en) | 2009-06-16 | 2013-09-17 | Chevron Phillips Chemical Company Lp | Oligomerization of alpha olefins using metallocene-SSA catalyst systems and use of the resultant polyalphaolefins to prepare lubricant blends |
| EP2485839A1 (en) * | 2009-10-06 | 2012-08-15 | Chevron Phillips Chemical Company LP | Oligomerization of olefin waxes using metallocene-based catalyst systems |
| CN101880340B (zh) * | 2010-06-12 | 2012-06-20 | 上海化工研究院 | 负载型茂金属催化剂及其制备方法和应用 |
| US8399724B2 (en) | 2011-03-25 | 2013-03-19 | Exxonmobil Chemical Patents Inc. | Vinyl terminated higher olefin copolymers and methods to produce thereof |
| US8501894B2 (en) | 2011-03-25 | 2013-08-06 | Exxonmobil Chemical Patents Inc. | Hydrosilyation of vinyl macromers with metallocenes |
| US8426659B2 (en) | 2011-03-25 | 2013-04-23 | Exxonmobil Chemical Patents Inc. | Vinyl terminated higher olefin polymers and methods to produce thereof |
| US8940839B2 (en) | 2011-03-25 | 2015-01-27 | Exxonmobil Chemical Patents Inc. | Diblock copolymers prepared by cross metathesis |
| US8455597B2 (en) | 2011-03-25 | 2013-06-04 | Exxonmobil Chemical Patents Inc. | Catalysts and methods of use thereof to produce vinyl terminated polymers |
| US8785562B2 (en) | 2011-03-25 | 2014-07-22 | Exxonmobil Chemical Patents Inc. | Amphiphilic block polymers prepared by alkene metathesis |
| US8835563B2 (en) | 2011-03-25 | 2014-09-16 | Exxonmobil Chemical Patents Inc. | Block copolymers from silylated vinyl terminated macromers |
| US8623974B2 (en) | 2011-03-25 | 2014-01-07 | Exxonmobil Chemical Patents Inc. | Branched vinyl terminated polymers and methods for production thereof |
| US8669326B2 (en) | 2011-03-25 | 2014-03-11 | Exxonmobil Chemical Patents Inc. | Amine functionalized polyolefin and methods for preparation thereof |
| US8669330B2 (en) | 2011-03-25 | 2014-03-11 | Exxonmobil Chemical Patents Inc. | Olefin triblock polymers via ring-opening metathesis polymerization |
| US8841397B2 (en) | 2011-03-25 | 2014-09-23 | Exxonmobil Chemical Patents Inc. | Vinyl terminated higher olefin polymers and methods to produce thereof |
| US8937139B2 (en) | 2012-10-25 | 2015-01-20 | Chevron Phillips Chemical Company Lp | Catalyst compositions and methods of making and using same |
| US8895679B2 (en) | 2012-10-25 | 2014-11-25 | Chevron Phillips Chemical Company Lp | Catalyst compositions and methods of making and using same |
| US9034991B2 (en) | 2013-01-29 | 2015-05-19 | Chevron Phillips Chemical Company Lp | Polymer compositions and methods of making and using same |
| US8877672B2 (en) | 2013-01-29 | 2014-11-04 | Chevron Phillips Chemical Company Lp | Catalyst compositions and methods of making and using same |
| SG11201509739VA (en) | 2013-07-17 | 2015-12-30 | Exxonmobil Chem Patents Inc | Process using substituted metallocene catalysts and products therefrom |
| WO2015009470A1 (en) | 2013-07-17 | 2015-01-22 | Exxonmobil Chemical Patents Inc. | Metallocenes and catalyst compositions derived therefrom |
| CN105358586A (zh) | 2013-07-17 | 2016-02-24 | 埃克森美孚化学专利公司 | 环丙基取代的茂金属催化剂 |
| US9938364B2 (en) | 2013-07-17 | 2018-04-10 | Exxonmobil Chemical Patents Inc. | Substituted metallocene catalysts |
| ES2703344T3 (es) | 2013-07-17 | 2019-03-08 | Exxonmobil Chemical Patents Inc | Metalocenos y composiciones catalíticas derivadas de ellos |
| EP3022234B1 (en) | 2013-07-17 | 2018-12-26 | ExxonMobil Chemical Patents Inc. | Substituted metallocene catalysts |
| US9809664B2 (en) | 2015-06-05 | 2017-11-07 | Exxonmobil Chemical Patents Inc. | Bimodal propylene polymers and sequential polymerization |
| CN107922537B (zh) | 2015-06-05 | 2021-07-27 | 埃克森美孚化学专利公司 | 气相或淤浆相中多相聚合物的制备 |
| US10329360B2 (en) | 2015-06-05 | 2019-06-25 | Exxonmobil Chemical Patents Inc. | Catalyst system comprising supported alumoxane and unsupported alumoxane particles |
| US10280233B2 (en) | 2015-06-05 | 2019-05-07 | Exxonmobil Chemical Patents Inc. | Catalyst systems and methods of making and using the same |
| EP3303423A1 (en) | 2015-06-05 | 2018-04-11 | ExxonMobil Chemical Patents Inc. | Single reactor production of polymers in gas or slurry phase |
| US10294316B2 (en) | 2015-06-05 | 2019-05-21 | Exxonmobil Chemical Patents Inc. | Silica supports with high aluminoxane loading capability |
| US10280235B2 (en) | 2015-06-05 | 2019-05-07 | Exxonmobil Chemical Patents Inc. | Catalyst system containing high surface area supports and sequential polymerization to produce heterophasic polymers |
| WO2016196331A1 (en) | 2015-06-05 | 2016-12-08 | Exxonmobil Chemical Patents Inc. | Supported metallocene catalyst systems for polymerization |
| US9732300B2 (en) | 2015-07-23 | 2017-08-15 | Chevron Phillipa Chemical Company LP | Liquid propylene oligomers and methods of making same |
| US11059918B2 (en) | 2016-05-27 | 2021-07-13 | Exxonmobil Chemical Patents Inc. | Metallocene catalyst compositions and polymerization process therewith |
| CN108864339B (zh) * | 2018-04-18 | 2021-03-05 | 上海拜乐新材料科技有限公司 | 一种金属茂化合物和一种烯烃聚合催化剂及其应用 |
| US11472828B2 (en) | 2019-10-11 | 2022-10-18 | Exxonmobil Chemical Patents Inc. | Indacene based metallocene catalysts useful in the production of propylene polymers |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2924593A (en) * | 1956-08-23 | 1960-02-09 | Hercules Powder Co Ltd | Polymerization of ethylene using as a catalyst the product formed by mixing a bis(cyclopentadienyl) zirconium salt with an alkyl metallic compound |
| BE564525A (es) * | 1957-02-05 | |||
| DE3127133A1 (de) * | 1981-07-09 | 1983-01-27 | Hoechst Ag, 6000 Frankfurt | Verfahren zur herstellung von polyolefinen und deren copolymerisaten |
| ZA844157B (en) * | 1983-06-06 | 1986-01-29 | Exxon Research Engineering Co | Process and catalyst for polyolefin density and molecular weight control |
| US4701432A (en) * | 1985-11-15 | 1987-10-20 | Exxon Chemical Patents Inc. | Supported polymerization catalyst |
| JPS63168408A (ja) * | 1986-12-29 | 1988-07-12 | Showa Denko Kk | ポリオレフインの製造方法 |
| US4892851A (en) * | 1988-07-15 | 1990-01-09 | Fina Technology, Inc. | Process and catalyst for producing syndiotactic polyolefins |
-
1989
- 1989-01-31 IT IT8919252A patent/IT8919252A0/it unknown
-
1990
- 1990-01-29 IL IL93203A patent/IL93203A0/xx not_active IP Right Cessation
- 1990-01-29 ZA ZA90640A patent/ZA90640B/xx unknown
- 1990-01-30 US US07/471,901 patent/US5049535A/en not_active Expired - Lifetime
- 1990-01-30 HU HU90595A patent/HUT53133A/hu unknown
- 1990-01-30 FI FI900466A patent/FI900466A0/fi not_active Application Discontinuation
- 1990-01-30 MX MX1930890A patent/MX19308A/es unknown
- 1990-01-30 AU AU48893/90A patent/AU643673B2/en not_active Ceased
- 1990-01-30 CA CA002008907A patent/CA2008907C/en not_active Expired - Fee Related
- 1990-01-30 CZ CS90429A patent/CZ42990A3/cs unknown
- 1990-01-30 NO NO900434A patent/NO175535C/no unknown
- 1990-01-31 AT AT90101892T patent/ATE97136T1/de not_active IP Right Cessation
- 1990-01-31 PT PT93024A patent/PT93024A/pt not_active Application Discontinuation
- 1990-01-31 MY MYPI90000152A patent/MY105224A/en unknown
- 1990-01-31 EP EP90101892A patent/EP0381184B1/en not_active Expired - Lifetime
- 1990-01-31 CN CN90101413A patent/CN1044821A/zh active Pending
- 1990-01-31 ES ES90101892T patent/ES2048871T3/es not_active Expired - Lifetime
- 1990-01-31 JP JP2021875A patent/JPH03197513A/ja active Pending
- 1990-01-31 DE DE90101892T patent/DE69004446T2/de not_active Expired - Fee Related
- 1990-01-31 BR BR909000416A patent/BR9000416A/pt not_active Application Discontinuation
- 1990-01-31 KR KR1019900001115A patent/KR900011793A/ko not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NO900434D0 (no) | 1990-01-30 |
| EP0381184B1 (en) | 1993-11-10 |
| ES2048871T3 (es) | 1994-04-01 |
| FI900466A0 (fi) | 1990-01-30 |
| DE69004446D1 (de) | 1993-12-16 |
| EP0381184A2 (en) | 1990-08-08 |
| CA2008907A1 (en) | 1990-07-31 |
| HUT53133A (en) | 1990-09-28 |
| BR9000416A (pt) | 1991-01-15 |
| MY105224A (en) | 1994-08-30 |
| IL93203A0 (en) | 1990-11-05 |
| NO175535C (no) | 1994-10-26 |
| HU900595D0 (en) | 1990-04-28 |
| AU4889390A (en) | 1990-08-09 |
| PT93024A (pt) | 1990-07-31 |
| CN1044821A (zh) | 1990-08-22 |
| CA2008907C (en) | 1996-08-20 |
| AU643673B2 (en) | 1993-11-25 |
| US5049535A (en) | 1991-09-17 |
| IT8919252A0 (it) | 1989-01-31 |
| KR900011793A (ko) | 1990-08-02 |
| NO175535B (no) | 1994-07-18 |
| EP0381184A3 (en) | 1990-08-22 |
| ZA90640B (en) | 1990-10-31 |
| JPH03197513A (ja) | 1991-08-28 |
| ATE97136T1 (de) | 1993-11-15 |
| NO900434L (no) | 1990-08-01 |
| CZ42990A3 (en) | 1996-07-17 |
| DE69004446T2 (de) | 1994-05-11 |
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